Clamp



FIG. 1 is a front elevational view of a clamp, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a perspective view thereof, showing the clamp from the top and front. 

The ornamental design for a clamp, as shown and described. 